ChEBI: 18-hydroxyoctadecanoic acid is an omega-hydroxy-long-chain fatty acid that is octadecanoic (stearic) acid in which one of the hydrogens of the terminal methyl group has been replaced by a hydroxy group. It has a role as an apoptosis inducer. It is a hydroxyoctadecanoic acid and an omega-hydroxy-long-chain fatty acid. It is a conjugate acid of a 18-hydroxyoctadecanoate.